Comment by jiggawatts

The default Mutex struct in Rust makes it impossible to modify the data it protects without holding the lock.

"Each mutex has a type parameter which represents the data that it is protecting. The data can only be accessed through the RAII guards returned from lock and try_lock, which guarantees that the data is only ever accessed when the mutex is locked."

Even if used with more complex operations, the RAII approach means that the example you provided is much less likely to happen.